I have been looking to add a skylight to an interior room that could really benefit from a skylight. The prime location for this skylight is right where a ceiling light exists. I've been looking into the Solatube skylights with the light-kit add-on, but wasn't sure if there was something else I should be considering. The difficult part is that I have a flat roof which has a thickness of about 4-6" (I need to find out for sure). I'm also looking into a new roof so it would be best to figure this out to be done at the same time.